Arrangement for multiplex directional receiving



N. VON KORSHENEWSKI ARRANGEMENT FOR MULTIPLEX DIRECTIONAL RECEIVING April 10,1928.

Filed J n 19, 1924 3 Sheets-Sheet l NICOLM VON KORSHENEWSKI I INVENTOR ATTORNEY April 10, 1928. 1,666,024

N. VON KQRSHENEWSKI ARRANGEMENT FOR MULTIPLEX DIRECTIONAL RECEIVING Filed June 19, 1924 3 Sheets-Sheet 2 INVENTOR NKIOLM VON KURSHENEWSKl TORNEY April 10,1928. 1,666,024

N. VON KORSHENEWSKI ARRANGEMENT FOR MULTIPLEX DIRECTIONAL RECEIVING Filed June 19. 1924 3 Sheets-Sheet 3 NICOLM VON KORSHENEWSKI INVENTOR BY [MM ATTORN EY Y Patented Apr. 10, 1928.

UNITED STATES PATENT OFFICE.

. NICOLAI von xonsnnnnwsnr, or BERLIN, GERMANY, ASSIGNOR To GESELLSCHAFT Fun DRAI-ITLOSE TELEGRAPHIE M. B. or BERLIN, GERMANY, A CORPORATION OF GERMANY.

ARRANGEMENT FOR M'ULTIPLEX DIRECTION-AL RECEIVING.

Application filed June 19, 1924, Serial No.,720,909, and in Germany June 28, 1923.

My invention relates to receiving arrangements used for receiving radio signals and has for its object to provide a multiplex directional receiving arrangement, by means of which several diflerent wave lengths may be received simultaneously from one direction only.

A further object of the invention is to provide such an arrangement which will employ as its sole aerial means, a loop aerial appropriately grounded. V

These and other objects will be apparent from the following description and claims when considered with the accompanying drawing, in which:

Fig. 1 shows a receiving arrangement in which one grounded loop aerial and two high aerials are used.

Fig. 2 shows a receiving arrangement in which only one loop aerial appropriately grounded is used.

Fig. 3 shows a modification of a detail of the arrangement shown in Fig.

The known arrangements for the simultaneous directional receiving of several wave lengths by means of an aperiodic directional aerial arrangement, are such that the frame aerial effects of the different waves are aperiodically led across a circuit bymeans of non-reactive vacuum valve couplings to the receiving circuits tuned to the wave lengths to be received.

A simultaneous double-sided directional receiving can be attained for every desired wave length with such an arrangement.

In order to attain'a one-way directional ef-- feet for the receivingof the different wave lengths, the directional aerial is combined in the known way with a high aerial for each wave length. This aerial arrangement has a one-way directive receiving characteristic for each frequency to be received. The shape of the characteristic can bealtered in the known way and the positions of the angles atwhich'no signals can bereceived adjusted by suitably regulating the amplitudes and phases of the frame aerial effect and different high aerial effects.

Fig. 1 of the annexed drawing shows'the principle of the connection of such an arrangement. A is the aerial from which the directive aerial effects are aperiodically led by means of coupling 10 and circuit K to non-reactive coupling arrangement 0. From '15 and 16 respectively.

. by means of condensers 36, 37 and 38.

non-reactive coupling arrangement 0 the directive aerial effects are led to the receiving circuits 1, 2and 3 by means of couplings'll, 12 and 13 respectively. Receiving circuits 1, 2 and 3 are tuned to Wave lengths A A and a jby means of variable condensers 14:,

The frame aerial A is grounded and used as one high aerial 'A,. Two auxiliary high aerials A and A are also used. The aerial effects of the three high aerials A ",'A and A are transferred to circuits K K and K by means of couplings 17-, 18 and 19 respectively. From circuits K K and K these effects are transferred to the receiving circuits 1, 2and 3 by means of couplings 20,.21 and'22.

High aerials A A and A have condensers 23, 24 and 25 for tuning to the desired-frequency or adjusting the phase of the voltage induced into the receiving circuits from the high aerials.

As is Well known the frame aerial effect and a high aerial effect for a particular wave length is combined in each of the receiving circuits 1, 2 and 3to give the desiredoneway directional receiving characteristic. This known arrangement guarantees a good simultaneous receivlng of several different wave lengths free from disturbances, but this arrangement is very expensive, because justas many high aerials arerequired as wave lengths to be simultaneouslyreceived.

Referring to Fig. 2, according to the present invention, all aerial effects necessary for attaining the desired receiving characteristic are supplied'by one single combined high aerial'and frame aerial B for all frequen- 'cies. Thevoltagesof the different frequen cies dueto. thehigh, aerial effects are led from this aperiodic high aerial. (or an aerial, the natural. frequency of which much differs from the receiving frequencies) to the input circuitsofvacuumyalv-es R R and R by..means of couplings-30,31 and 32. The plate-filament circuit-s of these valves are connected to oscillatory circuits 33, 34 and 35 tuned to the frequencies A a, and a It is obvious, that the intensity of currents in circuits 33, 34 and 35 is independent of the direction of the incoming waves and corresponds to the aerial effect of the high aerials tuned to these wave lengths. The

aerial effect is led to receiving circuits 61.,

62 and 63 by means of couplings 46, 47 and 48.

As in the ease of the arrangement shown in Fig. 1 the high aerial effect and the frame aerial effect for each wave length 1s combined in the particular receiving circuit tuned for that wave length to obtain the desired one-way directional receiving characteristic.

It is not necessary to use a separate vac uum tube for each frequency, but a common vacuum tube R can be employed, the platefilament circuit- ,of which contains several oscillatory circuits 51, 52 and 53 tuned to the single wave lengths as shown in Fig. 3. Of course. this connection may be suitably altered. It is, for instance, possible to use a common aperiodic cable for transferring the single aerial effects instead of the separate cables H 'H and li and furthermore couplings without reaction in order to prevent mutual distubances of the single waves. Besides the known means for producing phase-displacement (phase-regulators) must bepresentin order to be able to suitably adjust the phases of the aerial effects.

Havingdeseribed my invention, what I claim is: i

1. In combination, a directional aerial, means associated therewith and tuned to different frequencies for producing a plurality of non-directional antenna effects, means for combining the effects produced by the directional aerial and said non-directional means, said combining means having a tuning element for each of the non-directional effects whereby more than one frequencymay be simultaneously received on the aerial and first mentioned means from a single direction.

2. In combination, an aperiodic directional aerial,-tuned means associated therewith for producing non-directional antenna effects, circuits for combining the effects produced by the aerial'and said tuned. means, said clrcuits having a tunln element for each of the non-directlonal ehects whereby more than one frequency may be simulta-e neously received. 1 1

3. In combination, a single aperiodic directional antenna, aperiodic amplifying means associated therewith, means associated with said antenna for producing non-directionalantenna effects, means for combining the effects produced by the antenna and the last mentioned means, said combining means having tuned amplifiers and different tuning elements forcach of the non directional effects whereby a series of different frequency signals may be received through but one direction.

4. In combination a single aperiodic directional antenna a series of aperiodic vacuum tube amplifying circuits associated therewith for producing a plurality of directional antenna effects. a series of tuned vacuum tube amplifier circuits for producing non-directional antenna effects, means comprising a pluralityof receiver circuits each associated with one of said aperiodic circuits'and with one of said tuned circuits whereby a series of strengthened signals of different frequencies may be received from one direction.

In combination a grounded loop anten 11a, a plurality of aperiodic amplifiers associated with said loop, a receiver coupled to each of said amplifiers, a plurality-of tuned amplifiers coupled to the ground connection of said loop antenna, said tuned amplifiers each being also coupled to one of saidreceivers whereby the signals set up in said receivers by said loop acting as a directional antenna will be strengthened by signals set up in said tuned amplifiers by said loop act ing as a non-directional antenna.

loop antenna for non-directi0nal reception and a series of receivers each coupled to one amplifier of each series whereby a series of different frequency signals may be received through but one direction.

NICOLAI von KORSHENEWSKI. p 

